/// <summary cref="DirectXBuffer.OnMap(DeviceContext)"/>
protected override unsafe IntPtr OnMap(DeviceContext context)
{
Debug.Assert(cudaArray == IntPtr.Zero);
CudaException.ThrowIfFailed(
CudaNativeMethods.cuGraphicsSubResourceGetMappedArray(
out cudaArray,
cudaGraphicsResource,
0,
0));
Debug.Assert(cudaArray != IntPtr.Zero);
if (buffer == null)
{
CudaException.ThrowIfFailed(
CudaNativeMethods.cuArrayGetDescriptor(out desc, cudaArray));
pixelByteSize = CudaNativeMethods.GetByteSize(desc.arrayFormat) * desc.numChannels;
buffer = Accelerator.Allocate <byte>(
desc.width.ToInt32() * desc.height.ToInt32() * pixelByteSize);
}
Debug.Assert(pixelByteSize > 0);
if (ViewFlags != DirectXViewFlags.WriteDiscard)
{
// Copy texture data to buffer
var args = new CudaMemcpy2DArgs()
{
dstDevice = buffer.NativePtr,
dstMemoryType = CudaMemoryType.Device,
srcArray = cudaArray,
srcMemoryType = CudaMemoryType.Array,
WidthInBytes = new IntPtr(desc.width.ToInt32() * pixelByteSize),
Height = desc.height,
};
CudaException.ThrowIfFailed(
CudaNativeMethods.cuMemcpy2D(ref args));
}
return(buffer.NativePtr);
}
/// <summary cref="DirectXBuffer.OnUnmap(DeviceContext)"/>
protected override unsafe void OnUnmap(DeviceContext context)
{
Debug.Assert(pixelByteSize > 0);
if (ViewFlags != DirectXViewFlags.ReadOnly)
{
// Copy buffer data to texture
var args = new CudaMemcpy2DArgs()
{
srcDevice = buffer.NativePtr,
srcMemoryType = CudaMemoryType.Device,
dstArray = cudaArray,
dstMemoryType = CudaMemoryType.Array,
WidthInBytes = new IntPtr(desc.width.ToInt32() * pixelByteSize),
Height = desc.height,
};
CudaException.ThrowIfFailed(
CudaNativeMethods.cuMemcpy2D(ref args));
}
cudaArray = IntPtr.Zero;
}
public static extern CudaError cuMemcpy2D(
ref CudaMemcpy2DArgs args);
